o/d off flashing on 2002 Mazda MPV

just started today... very hot day . i drove about 2 mile and noticed a lerch in the tranny while shifting.. then at a light the o/d off started flashing.. i took it easy as i could the rest of the way ,, i had to let off the gas at each shift to not have the abrubt shift.. when i park at home and let it sit for a few minutes. i restarted and took a short ride and it was find... no light flashing... so heres where i`m at.. do i wait to see if it happens again and take it to the dealership.. or take it now!???help

I drive an 2002 Explorer with 168,000 miles; it has the 5R55W automatic transmission in it. Like many of you, my O/D light started flashing, and I was getting a hard shift from 2-3. After much research , including from this site, I learned that the problem is NOT solved by replacing the transmission. The problem is solved by replacing the auto trans solenoid pack (drop the pan, replace the solenoid pack, replace the the pan and refill with fluid). I had the repair done for just over $500 - labor & parts. The challenge is finding a transmisson specialist who understands the problem and is willing to do the solenoid replacement INSTEAD of replacing the transmission. My transmission is now shifting silky smooth.